down migration from catalog version 20 to 19

20_to_19.sql

ALTER TABLE hdb_catalog.hdb_table DROP COLUMN is_enum;

CREATE FUNCTION hdb_catalog.hdb_table_oid_check() RETURNS trigger AS
  $function$
BEGIN
  IF (EXISTS (SELECT 1 FROM information_schema.tables st WHERE st.table_schema = NEW.table_schema AND st.table_name = NEW.table_name)) THEN
    return NEW;
  ELSE
    RAISE foreign_key_violation using message = 'table_schema, table_name not in information_schema.tables';
    return NULL;
  END IF;
END;
$function$
  LANGUAGE plpgsql;

CREATE TRIGGER hdb_table_oid_check BEFORE INSERT OR UPDATE ON hdb_catalog.hdb_table
  FOR EACH ROW EXECUTE PROCEDURE hdb_catalog.hdb_table_oid_check();


DROP VIEW hdb_catalog.hdb_table_info_agg;
DROP VIEW hdb_catalog.hdb_column;
DROP VIEW hdb_catalog.hdb_foreign_key_constraint;

CREATE VIEW hdb_catalog.hdb_foreign_key_constraint AS
SELECT
    q.table_schema :: text,
    q.table_name :: text,
    q.constraint_name :: text,
    min(q.constraint_oid) :: integer as constraint_oid,
    min(q.ref_table_table_schema) :: text as ref_table_table_schema,
    min(q.ref_table) :: text as ref_table,
    json_object_agg(ac.attname, afc.attname) as column_mapping,
    min(q.confupdtype) :: text as on_update,
    min(q.confdeltype) :: text as on_delete
FROM
    (SELECT
        ctn.nspname AS table_schema,
        ct.relname AS table_name,
        r.conrelid AS table_id,
        r.conname as constraint_name,
        r.oid as constraint_oid,
        cftn.nspname AS ref_table_table_schema,
        cft.relname as ref_table,
        r.confrelid as ref_table_id,
        r.confupdtype,
        r.confdeltype,
        UNNEST (r.conkey) AS column_id,
        UNNEST (r.confkey) AS ref_column_id
    FROM
        pg_catalog.pg_constraint r
        JOIN pg_catalog.pg_class ct
          ON r.conrelid = ct.oid
        JOIN pg_catalog.pg_namespace ctn
          ON ct.relnamespace = ctn.oid
        JOIN pg_catalog.pg_class cft
          ON r.confrelid = cft.oid
        JOIN pg_catalog.pg_namespace cftn
          ON cft.relnamespace = cftn.oid
    WHERE
        r.contype = 'f'
    ) q
    JOIN pg_catalog.pg_attribute ac
      ON q.column_id = ac.attnum
         AND q.table_id = ac.attrelid
    JOIN pg_catalog.pg_attribute afc
      ON q.ref_column_id = afc.attnum
         AND q.ref_table_id = afc.attrelid
 GROUP BY q.table_schema, q.table_name, q.constraint_name;

CREATE VIEW hdb_catalog.hdb_table_info_agg AS (
select
  tables.table_name as table_name,
  tables.table_schema as table_schema,
  coalesce(columns.columns, '[]') as columns,
  coalesce(pk.columns, '[]') as primary_key_columns,
  coalesce(constraints.constraints, '[]') as constraints,
  coalesce(views.view_info, 'null') as view_info
from
  information_schema.tables as tables
  left outer join (
    select
      c.table_name,
      c.table_schema,
      json_agg(
        json_build_object(
          'name',
          column_name,
          'type',
          udt_name,
          'is_nullable',
          is_nullable :: boolean
        )
      ) as columns
    from
      information_schema.columns c
    group by
      c.table_schema,
      c.table_name
  ) columns on (
    tables.table_schema = columns.table_schema
    AND tables.table_name = columns.table_name
  )
  left outer join (
    select * from hdb_catalog.hdb_primary_key
  ) pk on (
    tables.table_schema = pk.table_schema
    AND tables.table_name = pk.table_name
  )
  left outer join (
    select
      c.table_schema,
      c.table_name,
      json_agg(constraint_name) as constraints
    from
      information_schema.table_constraints c
    where
      c.constraint_type = 'UNIQUE'
      or c.constraint_type = 'PRIMARY KEY'
    group by
      c.table_schema,
      c.table_name
  ) constraints on (
    tables.table_schema = constraints.table_schema
    AND tables.table_name = constraints.table_name
  )
  left outer join (
    select
      table_schema,
      table_name,
      json_build_object(
        'is_updatable',
        (is_updatable::boolean OR is_trigger_updatable::boolean),
        'is_deletable',
        (is_updatable::boolean OR is_trigger_deletable::boolean),
        'is_insertable',
        (is_insertable_into::boolean OR is_trigger_insertable_into::boolean)
      ) as view_info
    from
      information_schema.views v
  ) views on (
    tables.table_schema = views.table_schema
    AND tables.table_name = views.table_name
  )
);

UPDATE hdb_catalog.hdb_version
   SET version = '19'
 WHERE version = '20';